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I have two 951 carb engines I am assembling, and both are about .090 squish with a head gasket installed and no base gasket. I think the spec is .067 to .091. One has a WSM crank, the other is SeaDoo. Pistons in both engines are WSM. Based on what I know, I need to deck them about .030. This...

What happened to this balance shaft? I have never seen one machined like this. Any thoughts?

When replacing the MPEM, the manual states "In this operation, the ignition timing light and B.U.D.S. are used to synchronize the MPEM TDC reference with the engine crankshaft." You really have to use a timing light? I haven't had one in my hands since the 70's! I didn't know they made them anymore!

I picked up another Di (I know, I am a glutton for punishment) and it doesn't have a key. The key dude tried a few times and said he couldn't do it. He said he got access to the MPEM and could see if there were any issues but before he could make the key, the MPEM stopped communicating with the...

I have a 99 XP and when you put the key in, the bilge does not run. The pump checks out. I disconnected it from the wiring harness. I think the bilge grounds through the MPEM, so I was thinking it was on its way out. I figured I will wait and see if the MPEM has any additional problems. Any...

I installed an ADA billet head on a Sea Doo 951. I checked the squish, and it is F .057 R .053. Is that ok? It seems a little tight. Also is a .04 difference ok? Thanks!

I am looking for a XP Di in good condition but with a bad engine. I would like it for a winter project knowing that I may need to take an anger management class during the project. Anyone that can work on a Di for any length of time and not get angry makes Master Po look like Alec Baldwin.

I have 2 951 engines. I am thinking about a billet head for one of them. I have one with 49cc domes for a bore of 89.5mm. SD spec for domes is 51.8 +/- .6. For a slightly modified engine is 49cc too small? I want to run 91 octane. Per ADA, the 50cc dome the compression is 155 and for 48cc its...

I am looking at a 2001 XP and noticed this white wire that looks like a jumper wire. What is the purpose of this white wire?

I am putting this 951 together and have a question. I am almost certain that the RAVE valves have been shaved (about .020) but I don't want any issues. Is there enough clearance if I can get a .015 feeler gauge between the piston and the RAVE valve? What happens if too much has been removed? Thanks!

I am doing a leak down test on a 951 and it leaks at the cylinder head studs. Any idea what could cause this?

Can 951 carb engine cases be mismatched? One of mine has a large hole in the bottom case and isn't repairable. Can I get a used lower case with my good top case? I think SD says no. Thoughts?

I need to go to more than 1mm over on a 951. I have a choice of Wossner vs Wiseco. I hear both are good. Thoughts? Also, what should be the clearance, stock per the manual is .0035. Too tight for forged?

The piston on the left came out of a 951 Di with 216 hours on it. The one on the left has 4 hours on it. It looks like water got in it. Any ideas?

I have a 947 carbed engine that I just rebuilt and there is some water on the RAVE valves. I did a leak down test after I rebuilt and yesterday, and it passed both times. I had a leaking water regulator on the muffler and replaced it with a used one, and it appears this leak started after...

My 951 engine has .8 hours on it over the last few weeks after rebuild. I have only been running it on the trailer at idle and revving it up, to get it set up. I havent ridden it yet. I looked and the pistons are clean, NO carbon at all. I see no evidence of water in it. My question is how long...

I have a 99 XP 947 that I picked up recently. The engine was wasted by the previous owner so I rebuilt it. The engine runs well, but the issue is 1. the tuned pipe gets very hot after a couple minutes of operation and 2. hardly any water exits on the left side of the hull. The cylinder and...

I have a 99 XP and when I plug the key in, the bilge pump makes no noise. I ran power directly to it and it works. Any ideas? If I remember correctly, it grounds in the MPEM, could this be an MPEM issue? (Please say no, please say no....) Thanks!

I had to drill out one in the carb. The hardware store doesnt have anything that small. Any ideas? Thanks!

I have a 99 XP and this carb clamp for the fuel hose is missing. Anyone have one laying around? Any suggestions on how to fabricate?